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(No Model.)

D. RAVBKEAS.

APPARATUS POR COOLING WHITE LEAD.

WITHEEEBE:

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DAVID RAVFKIDS, OF SAN FRANCISCO, CALIFORNIA.

APPARATUS FOR COOLING WHITE LEAD.

SEFECIFICATION forming part of Letters Patent No. 335,'7'73l datedFebruary 9, 1886.

Application filed March IE?, 1895.

To @ZZ whom, it may concern:

Be it known that I, DAVID RAvEKEs, a citizen of the United States,residing in the city and county of San Francisco, VState of California,have invented certain new and useful Improvements in Machinery orApparatus for Cooling Vhite Lead; and I do hereby declare that thefollowing is a full, clear, and exact description of my said invention,reference being had to the accompanying drawings, that form a part ofthis specification.

My invention has for its object to produce a machine or apparatus forcooling white lead after grinding in its manufacture; and the sameconsists in the construction and combination of parts, hereinafterparticularly described and pointed out. These parts comprise a pan orreceptacle, of cylindrical form, with hollow sides and bottom forcirculation of a cooling-liquid, a scraping device to travel aroundagainst the sides and bottom of the receptacle, vand suitable mechanismfor working` this device. The following description fully explains theconstruction of these parts and the general operation of the machine orapparatus produced by combining them together, the accompanying drawingsbeing referred to by figures and letters.

Figure l is au elevation of the apparatus with the receptacle in sectionto show the chamber or space for circulation of the cooling-liquid. rIhepipes for inflow and outflow are broken away from their connection withsuitable supply and waste. Fig. 2 is a top view of the receptacle andthe device for stirring the matter under treatment in the receptacle,the driving mechanism and the standards or supporting-frame beingremoved at about the horizontal line :c m, Fig. l. Fig. 3 is a detailview in perspective of a construction of scraping device and itsattachment to Serial No. 158,031. (No model.)

ing also a pipe, cicli. These two pipes have suitable valves or cocks, dd.

rIhe cooling-liquid flowing from a suitable supply passing into thehollow space B, and p thence out through the waste-pipe, the flow orcirculation is regulated by means of the cocks before described.

E is a hollow post or pillar, fixed upright in the center of thereceptacle, and forming a step and socket for the end and lower part ofan upright shaft, F. At the upper end this shaft passes through and hasa bearing in a cross beam or plate, G, that extends over the receptacle,and rests at its ends upon upright supports 71.11., secured to the sidesofthe receptacle.

I I are boxes fixed upon this beam, and .Tis a pulley-shaft carriedinsaid boxes. By means ,of bevel wheel and pinion L Im--the one fixed onthe upright shaft, the other on the crossshaft-the two shafts areconnected, and movement of the one drives the other.

The scraping devices N are blades or plates having straightscraping-edges n n n2, and fixed to a carrying-arm, I), that is fast onthe upright shaft. rIheir edges are set to run against the surfaceswithin the receptacle, so that when in motion they keep removing thematter under treatment off from the coolingsurfaces and bringing otherportions of the matter into contact with such surfaces. In Fig. 3 of thedrawings is represented a construction of such scraping device fromwrought metal and principally out of a single piece. The upright membersn* a* hold the lower scraper, n, in position to run against the bottomof the receptacle, and the outer one of these members has a verticaledge, a', set to run against the perpendicular sides of the receptacle.On the back or inner side of the other upright is fixed ascraping-blade, a, with a vertical edge to run against the surface ofthe center pillar around the shaft. The ends of the uprights n* n*arebent over at right angles to come latwise against the under side ofthe carrying-arm,and secured by screws or other suitable fastening meansto the arm. In the apparatus which I have constructed in accordance withmy invention I have found that two scraping devices set diametricallyopposite to each other will operate well; but

IOO

I do not confine myself to the use of this particular number of suchscraping devices.

The operation of the apparatus as thus constructed is as follows: Thedriving-shaft receives motion'through the belt and pulley or othersuitable means from an engine-shaft or line .of shafting, and thescraping devices are kept revolving in the receptacle around the shaftand through the material being treated. A circulation of thecooling-liquid-such as Water at suitably 10W temperature-is pro! ducedthrough the hollow space beneath the bottom and behind the perpendicularwalls of 'the receptacle, so that the'heat is constantly being absorbedand carried oft by the liquid. The movement 0i' the serapi ng devices through the mass of matter in the receptacle brings other portions orparticles into contact With the cooling-surfaces as fast as thescrapingedges remove the matter from the surfaces, and in this actionthe devices are sti rrers as well as Scrapers. The operation continuesuntil the contents of the receptacle are brought to the desiredcondition.

To facilitate the removal of the contents, a discharge-opening isprovided at one side of the receptacle. This discharge is shown at R inFig. 2 of the drawings by the dotted lines extending from the outside tothe inside and across the space between the two walls.. These linesrepresent a tubuluar passage extending across the hollow space. Theopening is closed by a sliding gate, R', thatis movable in guides 1 712on the outside of the receptacle, and is Worked by a lever, rlhe fulcrumof this lever is at r4 on the receptacle, and one end is attached to thegate at 15, While the outer end forms a handle Wherewith to move thegate.

Having thus described my invention, What I desire to claim and secure byLetters Patent 1s- 1. An apparatns for eoolingwhite lead, consisting ofa pan or receptacle having a hollow space beneath its bottom and behindits Walls connected together to form a single chamber, and an inlet andan outlet aperture, and connections for passage and circulation of acooling medium, as Water, a rotating shaft set np- -right in saidreceptacle and provided with a scraping device the edges of which areset to run against the surfaces of the said receptacle, and mechanism,substantially as specified, for imparting 'rotation t0 said shaft, asset forth.

2. A Whitelead cooler having Hat bottom and perpendicular sides with ahollow space or chamber surrounding the bottom and sides of said coolerto contain a cooling medium, as Water, an inlet and an outletin the saidspace or chamber, with connections having cocks to control the flow ofthe cooling medium, and a scraping device on which are scraping-edgesset to Work against the interiorsuriaces of the receptacle, andmechanism forimparting mo-v tion to said scraping device, substantiallyas herein specified, to operate as set forth.

